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    Adjusting Camera Lens for Sharp Image: 72.0mm Focal Length at 1.90m Distance

    Figure 36.36 diagrams a cross-section of a camera. It has a single lens of focal length 72.0 mm, which is to form an image on the film at the back of the camera. Suppose the position of the lens has been adjusted to focus the image of a distant object. How far and in what direction must the lens...